Figure 2. Below halocline vertical flux.

Vertical flux (log cells µm⁻² sec⁻¹) of H. akashiwo, below the halocline, in the absence (top) and presence (bottom) of the predator. Warmer colors = upward flux and cooler colors = downward flux of phytoplankton cells. After 6 h, in the presence of the predator, the vertical flux of H. akashiwo was strongly and persistently upward. In contrast, the vertical flux of H. akashiwo in the absence of a predator was initially downward and then directionally inconsistent resulting in no effective change in population distribution.